John,
You could make a lot if you trained owls!
The balls in the above photo I found have short 'normal sprues. Not long tails.
I also found in a later thread of Michael's, that he later thought that the short -cut tow must be for cleaning the pan, as the balls were made into cartridges, so no need of wadding.
It is sad I can't ask him further questions, like were extra balls carried in another pouch? as if they Were, tow could be resorted to when the cartridges were expended.